Micropatterned Polyvinyl Butyral Membrane for Acid−Base Diodes

Roszol, László; Lawson, Thuy; Koncz, Viktória; Noszticzius, Zoltán; Wittmann, Mária; Sarkadi, Tamás; Koppa, Pál

doi:10.1021/jp106773y

Cited by 15 publications

(17 citation statements)

References 26 publications

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“…14,15 In the electrolyte diodes developed for analytical purposes, hydrogels are commonly utilized as connecting elements between the acidic and alkaline reservoirs. 16,17 Environmental-sensitive hydrogels are frequently used materials not only in chemistry and physics but also in biomedical applications, such as tissue engineering and drug delivery. 18,19 For those kinds of applications, the improvement of shear-thinning and self-healing properties together with a reduced response time is essential and may be tuned by changes in pH or temperature.…”

Section: Introductionmentioning

confidence: 99%

Determination of the diffusion coefficient of hydrogen ion in hydrogels

Schuszter

Gehér-Herczegh

Szűcs

et al. 2017

Phys. Chem. Chem. Phys.

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The role of diffusion in chemical pattern formation has been widely studied due to the great diversity of patterns emerging in reaction-diffusion systems, particularly in H-autocatalytic reactions where hydrogels are applied to avoid convection. A custom-made conductometric cell is designed to measure the effective diffusion coefficient of a pair of strong electrolytes containing sodium ions or hydrogen ions with a common anion. This together with the individual diffusion coefficient for sodium ions, obtained from PFGSE-NMR spectroscopy, allows the determination of the diffusion coefficient of hydrogen ions in hydrogels. Numerical calculations are also performed to study the behavior of a diffusion-migration model describing ionic diffusion in our system. The method we present for one particular case may be extended for various hydrogels and diffusing ions (such as hydroxide) which are relevant e.g. for the development of pH-regulated self-healing mechanisms and hydrogels used for drug delivery.

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Section: Introductionmentioning

confidence: 99%

Determination of the diffusion coefficient of hydrogen ion in hydrogels

Schuszter

Gehér-Herczegh

Szűcs

et al. 2017

Phys. Chem. Chem. Phys.

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“…Due to the slow time response of the diode when PVA gel cylinder is used as a connecting element, a much thinner (and faster) PVB membrane was developed [8]. It was observed that during periodic switching of voltage between forward and reverse modes, an overshoot (a local maximum followed by a local minimum) appears in the measured current, when PVA gel cylinder is used as connecting element.…”

Section: Motivation Of the Researchmentioning

confidence: 99%

Transient Response of the Acid-base Diode for Polarity Change

Koncz

Noszticzius

Kály‐Kullai

2021

Period. Polytech. Chem. Eng.

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An application of the so-called acid-base diode would be the sensitive detection of nonhydrogen cations in an acidic medium based on salt-effects. For diode purposes different connecting elements between the acidic and aqueous reservoirs of the diode were developed, namely a polyvinyl alcohol (PVA) hydrogel cylinder, and a polyvinyl butyral (PVB) membrane. During the measurement of the voltage – current characteristic (VCC) of the diode, it was found, that in the case of PVA gel cylinder an overshoot (a local maximum followed by a local minimum) appeared in the time vs. current curve, while the diode was switched between modes (open or closed), that is the direction of the applied voltage was reversed. The overshoot did not appear in PVB membrane.The existence of overshoots was studied by numerical simulations. The time response of the diode with different hypothetic connecting elements was investigated, when the diode was switched between modes via changing the polarity of applied voltage. We found that larger diffusion coefficients of hydrogen and hydroxide ions explain the appearance of overshoots. By examining the concentration and potential profiles a qualitative explanation of this phenomenon was given.

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“…Dip-coating is also an alternative methodology successfully employed to prepare regular arrays of micrometer pores [76,77]. As depicted in (iv), in this case, due to the vertical position of the glass slide and the liquid surface, the mechanism is slightly different.…”

Section: General Strategies: To Fabricate Porous Films By Bfsmentioning

confidence: 99%

Breath Figures: Fabrication of Honeycomb Porous Films Induced by Marangoni Instabilities

Muñoz‐Bonilla¹,

Save²,

Billon³

et al. 2015

Polymer Surfaces in Motion

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The creation of porous polymer surfaces is a center of interest in current research. Porous surfaces possess extremely high specific surface areas, thus allowing their employment in a large variety of applications including electronics, photonics or biotechnology [1,2]. Pore size and distribution can play a major role in selective transportation or in insulation processes amongst others [3]. Those porous materials with cavities in the micrometer size range are interesting in catalysis, sensors, membrane preparation or as scaffolds for composite materials. Moreover porous materials with pore dimensions comparable to the wavelength of visible light are of interest as photonic band-gaps and optical stop-bands.Structures with micrometer or submicrometer dimensions can be created using different templating methods [4,5]. A large variety of approaches have been developed and employed to prepare microporous structured materials, including the use of templates such as ordered arrays of colloidal particles to produce inverse opal structures [6][7][8][9], from transformed polymeric sphere arrays [10,11], using emulsion droplets as templates [12], employing natural biological templates [13][14][15][16], by

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Micropatterned Polyvinyl Butyral Membrane for Acid−Base Diodes

Cited by 15 publications

References 26 publications

Determination of the diffusion coefficient of hydrogen ion in hydrogels

Determination of the diffusion coefficient of hydrogen ion in hydrogels

Transient Response of the Acid-base Diode for Polarity Change

Breath Figures: Fabrication of Honeycomb Porous Films Induced by Marangoni Instabilities

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